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Joseph Parker's camp have gone on the offensive against fellow world champion Anthony Joshua, saying he has a "glass jaw" and will fold at the first sign of pressure like the England team at a football World Cup.

Parker, promoter David Higgins and trainer Kevin Barry will this morning give an update on negotiations on a showdown between the New Zealand heavyweight, the WBO world champion, and IBF and WBA world title holder Joshua, but in the meantime Higgins has gone for the jugular.

In a statement to media, Higgins said he would reveal in an exclusive video over a minute long which shows Joshua, an Olympic gold medallist, being continually knocked down in sparring.

Higgins, and more recently Parker, have made a point of making reference to what they describe as Joshua's suspect chin.

Parker insists he has never been hurt in a fight or in sparring much less knocked down.

"There is a lot of hype and glamour [around Joshua]," Higgins told the Daily Mail. "But we believe Joshua will fold at unification level like England fail to reach World Cup finals."

The 25-year-old Parker wants a 40 per cent share of the purse against Joshua, with revenue shared rather than a fixed fee, but has said he would accept 35 per cent just to get the fight made.

A unification fight between the pair could happen as early as March, with the revenue undecided but likely Wembley or Cardiff's Principality Stadium. Joshua also has close connections in Dubai, so a fight in the Middle East wouldn't be out of the question either.

Trainer Barry continued a theme in an interview with Fight Talk, when he called the Englishman "robotic" and "predictable", adding: "The biggest chink in [Joshua's] armour out of everything is... I believe he has a suspect chin.

"You look at the names and the people he has fought and it's no wonder that chin hasn't been exposed a lot more. Look mate, we know he was knocked out in the amateurs, we know he's been knocked out in the gym sparring, we know an old 40-year-old Klitschko had him down.